PubChem

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PubChem is a free and open chemistry database at the National Institutes of Health (NIH). It collects information on chemical structures, identifiers, chemical and physical properties, biological activities, patents, health, safety, toxicity data, and many others. You can search chemicals by name, molecular formula, structure, and other identifiers.

PubChem records are contributed by hundreds of data sources, including government agencies, chemical vendors, journal publishers, and more.